If Xtracto does not recognise your bank's alerts, the template of the message is enough to add it. You do not need to register anywhere, and we do not want a single piece of your data: amounts, dates, merchants and numbers must not appear in what you send.
The easy way: open Xtracto, go to Captures, expand the alert it does not recognise and press “Help with this format”. The app brings you here with everything filled in and already obfuscated.